From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, alex.shi@linux.alibaba.com,
hannes@cmpxchg.org, hughd@google.com, linux-mm@kvack.org,
mhocko@suse.com, mm-commits@vger.kernel.org,
torvalds@linux-foundation.org, vdavydov.dev@gmail.com
Subject: [patch 02/78] mm/memcg: warning on !memcg after readahead page charged
Date: Fri, 18 Dec 2020 14:01:31 -0800 [thread overview]
Message-ID: <20201218220131.5zsD3yneg%akpm@linux-foundation.org> (raw)
In-Reply-To: <20201218140046.497484741326828e5b5d46ec@linux-foundation.org>
From: Alex Shi <alex.shi@linux.alibaba.com>
Subject: mm/memcg: warning on !memcg after readahead page charged
Add VM_WARN_ON_ONCE_PAGE() macro.
Since readahead page is charged on memcg too, in theory we don't have to
check this exception now. Before safely remove them all, add a warning
for the unexpected !memcg.
Link: https://lkml.kernel.org/r/1604283436-18880-3-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/mmdebug.h | 13 +++++++++++++
mm/memcontrol.c | 10 ++++------
2 files changed, 17 insertions(+), 6 deletions(-)
--- a/include/linux/mmdebug.h~mm-memcg-warning-on-memcg-after-readahead-page-charged
+++ a/include/linux/mmdebug.h
@@ -37,6 +37,18 @@ void dump_mm(const struct mm_struct *mm)
BUG(); \
} \
} while (0)
+#define VM_WARN_ON_ONCE_PAGE(cond, page) ({ \
+ static bool __section(".data.once") __warned; \
+ int __ret_warn_once = !!(cond); \
+ \
+ if (unlikely(__ret_warn_once && !__warned)) { \
+ dump_page(page, "VM_WARN_ON_ONCE_PAGE(" __stringify(cond)")");\
+ __warned = true; \
+ WARN_ON(1); \
+ } \
+ unlikely(__ret_warn_once); \
+})
+
#define VM_WARN_ON(cond) (void)WARN_ON(cond)
#define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
#define VM_WARN_ONCE(cond, format...) (void)WARN_ONCE(cond, format)
@@ -48,6 +60,7 @@ void dump_mm(const struct mm_struct *mm)
#define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)
#define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
+#define VM_WARN_ON_ONCE_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)
#endif
--- a/mm/memcontrol.c~mm-memcg-warning-on-memcg-after-readahead-page-charged
+++ a/mm/memcontrol.c
@@ -1362,10 +1362,7 @@ struct lruvec *mem_cgroup_page_lruvec(st
}
memcg = page_memcg(page);
- /*
- * Swapcache readahead pages are added to the LRU - and
- * possibly migrated - before they are charged.
- */
+ VM_WARN_ON_ONCE_PAGE(!memcg, page);
if (!memcg)
memcg = root_mem_cgroup;
@@ -6987,6 +6984,7 @@ void mem_cgroup_migrate(struct page *old
return;
memcg = page_memcg(oldpage);
+ VM_WARN_ON_ONCE_PAGE(!memcg, oldpage);
if (!memcg)
return;
@@ -7186,7 +7184,7 @@ void mem_cgroup_swapout(struct page *pag
memcg = page_memcg(page);
- /* Readahead page, never charged */
+ VM_WARN_ON_ONCE_PAGE(!memcg, page);
if (!memcg)
return;
@@ -7253,7 +7251,7 @@ int mem_cgroup_try_charge_swap(struct pa
memcg = page_memcg(page);
- /* Readahead page, never charged */
+ VM_WARN_ON_ONCE_PAGE(!memcg, page);
if (!memcg)
return 0;
_
next prev parent reply other threads:[~2020-12-18 22:01 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-18 22:00 incoming Andrew Morton
2020-12-18 22:01 ` [patch 01/78] mm/memcg: bail early from swap accounting if memcg disabled Andrew Morton
2020-12-18 22:01 ` Andrew Morton [this message]
2020-12-18 22:01 ` [patch 03/78] mm/memcg: remove unused definitions Andrew Morton
2020-12-18 22:01 ` [patch 04/78] mm, kvm: account kvm_vcpu_mmap to kmemcg Andrew Morton
2020-12-18 22:01 ` [patch 05/78] mm/memcontrol:rewrite mem_cgroup_page_lruvec() Andrew Morton
2020-12-18 22:01 ` [patch 06/78] epoll: check for events when removing a timed out thread from the wait queue Andrew Morton
2020-12-18 22:01 ` [patch 07/78] epoll: simplify signal handling Andrew Morton
2020-12-18 22:01 ` [patch 08/78] epoll: pull fatal signal checks into ep_send_events() Andrew Morton
2020-12-18 22:01 ` [patch 09/78] epoll: move eavail next to the list_empty_careful check Andrew Morton
2020-12-18 22:01 ` [patch 10/78] epoll: simplify and optimize busy loop logic Andrew Morton
2020-12-18 22:02 ` [patch 11/78] epoll: pull all code between fetch_events and send_event into the loop Andrew Morton
2020-12-18 22:02 ` [patch 12/78] epoll: replace gotos with a proper loop Andrew Morton
2020-12-18 22:02 ` [patch 13/78] epoll: eliminate unnecessary lock for zero timeout Andrew Morton
2020-12-18 22:02 ` [patch 14/78] kasan: drop unnecessary GPL text from comment headers Andrew Morton
2020-12-18 22:02 ` [patch 15/78] kasan: KASAN_VMALLOC depends on KASAN_GENERIC Andrew Morton
2020-12-18 22:02 ` [patch 16/78] kasan: group vmalloc code Andrew Morton
2020-12-18 22:02 ` [patch 17/78] kasan: shadow declarations only for software modes Andrew Morton
2020-12-18 22:02 ` [patch 18/78] kasan: rename (un)poison_shadow to (un)poison_range Andrew Morton
2020-12-18 22:02 ` [patch 19/78] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_* Andrew Morton
2020-12-18 22:02 ` [patch 20/78] kasan: only build init.c for software modes Andrew Morton
2020-12-18 22:02 ` [patch 21/78] kasan: split out shadow.c from common.c Andrew Morton
2020-12-19 0:28 ` Marco Elver
2020-12-19 1:13 ` Andrew Morton
2020-12-19 10:01 ` Marco Elver
2020-12-19 10:11 ` Marco Elver
2020-12-19 18:01 ` Andrey Konovalov
2020-12-19 19:17 ` Linus Torvalds
2020-12-19 19:26 ` Linus Torvalds
2020-12-21 9:46 ` Alexander Potapenko
2020-12-21 17:41 ` Linus Torvalds
2020-12-22 18:38 ` Andrew Morton
2020-12-22 12:00 ` kernel test robot
2020-12-18 22:02 ` [patch 22/78] kasan: define KASAN_MEMORY_PER_SHADOW_PAGE Andrew Morton
2020-12-18 22:02 ` [patch 23/78] kasan: rename report and tags files Andrew Morton
2020-12-18 22:02 ` [patch 24/78] kasan: don't duplicate config dependencies Andrew Morton
2020-12-18 22:02 ` [patch 25/78] kasan: hide invalid free check implementation Andrew Morton
2020-12-18 22:02 ` [patch 26/78] kasan: decode stack frame only with KASAN_STACK_ENABLE Andrew Morton
2020-12-18 22:02 ` [patch 27/78] kasan, arm64: only init shadow for software modes Andrew Morton
2020-12-18 22:02 ` [patch 28/78] kasan, arm64: only use kasan_depth " Andrew Morton
2020-12-18 22:03 ` [patch 29/78] kasan, arm64: move initialization message Andrew Morton
2020-12-18 22:03 ` [patch 30/78] kasan, arm64: rename kasan_init_tags and mark as __init Andrew Morton
2020-12-18 22:03 ` [patch 31/78] kasan: rename addr_has_shadow to addr_has_metadata Andrew Morton
2020-12-18 22:03 ` [patch 32/78] kasan: rename print_shadow_for_address to print_memory_metadata Andrew Morton
2020-12-18 22:03 ` [patch 33/78] kasan: rename SHADOW layout macros to META Andrew Morton
2020-12-18 22:03 ` [patch 34/78] kasan: separate metadata_fetch_row for each mode Andrew Morton
2020-12-18 22:03 ` [patch 35/78] kasan: introduce CONFIG_KASAN_HW_TAGS Andrew Morton
2020-12-18 22:03 ` [patch 36/78] arm64: enable armv8.5-a asm-arch option Andrew Morton
2020-12-18 22:03 ` [patch 37/78] arm64: mte: add in-kernel MTE helpers Andrew Morton
2020-12-18 22:03 ` [patch 38/78] arm64: mte: reset the page tag in page->flags Andrew Morton
2020-12-18 22:03 ` [patch 39/78] arm64: mte: add in-kernel tag fault handler Andrew Morton
2020-12-18 22:03 ` [patch 40/78] arm64: kasan: allow enabling in-kernel MTE Andrew Morton
2020-12-18 22:03 ` [patch 41/78] arm64: mte: convert gcr_user into an exclude mask Andrew Morton
2020-12-18 22:03 ` [patch 42/78] arm64: mte: switch GCR_EL1 in kernel entry and exit Andrew Morton
2020-12-18 22:03 ` [patch 43/78] kasan, mm: untag page address in free_reserved_area Andrew Morton
2020-12-18 22:03 ` [patch 44/78] arm64: kasan: align allocations for HW_TAGS Andrew Morton
2020-12-18 22:03 ` [patch 45/78] arm64: kasan: add arch layer for memory tagging helpers Andrew Morton
2020-12-18 22:03 ` [patch 46/78] kasan: define KASAN_GRANULE_SIZE for HW_TAGS Andrew Morton
2020-12-18 22:03 ` [patch 47/78] kasan, x86, s390: update undef CONFIG_KASAN Andrew Morton
2020-12-18 22:04 ` [patch 48/78] kasan, arm64: expand CONFIG_KASAN checks Andrew Morton
2020-12-18 22:04 ` [patch 49/78] kasan, arm64: implement HW_TAGS runtime Andrew Morton
2020-12-18 22:04 ` [patch 50/78] kasan, arm64: print report from tag fault handler Andrew Morton
2020-12-18 22:04 ` [patch 51/78] kasan, mm: reset tags when accessing metadata Andrew Morton
2020-12-18 22:04 ` [patch 52/78] kasan, arm64: enable CONFIG_KASAN_HW_TAGS Andrew Morton
2020-12-18 22:04 ` [patch 53/78] kasan: add documentation for hardware tag-based mode Andrew Morton
2020-12-18 22:04 ` [patch 54/78] kselftest/arm64: check GCR_EL1 after context switch Andrew Morton
2020-12-18 22:04 ` [patch 55/78] kasan: simplify quarantine_put call site Andrew Morton
2020-12-18 22:04 ` [patch 56/78] kasan: rename get_alloc/free_info Andrew Morton
2020-12-18 22:04 ` [patch 57/78] kasan: introduce set_alloc_info Andrew Morton
2020-12-18 22:04 ` [patch 58/78] kasan, arm64: unpoison stack only with CONFIG_KASAN_STACK Andrew Morton
2020-12-18 22:04 ` [patch 59/78] kasan: allow VMAP_STACK for HW_TAGS mode Andrew Morton
2020-12-18 22:04 ` [patch 60/78] kasan: remove __kasan_unpoison_stack Andrew Morton
2020-12-18 22:04 ` [patch 61/78] kasan: inline kasan_reset_tag for tag-based modes Andrew Morton
2020-12-18 22:04 ` [patch 62/78] kasan: inline random_tag for HW_TAGS Andrew Morton
2020-12-18 22:04 ` [patch 63/78] kasan: open-code kasan_unpoison_slab Andrew Morton
2020-12-18 22:04 ` [patch 64/78] kasan: inline (un)poison_range and check_invalid_free Andrew Morton
2020-12-22 14:02 ` kernel test robot
2020-12-18 22:05 ` [patch 65/78] kasan: add and integrate kasan boot parameters Andrew Morton
2020-12-18 22:05 ` [patch 66/78] kasan, mm: check kasan_enabled in annotations Andrew Morton
2020-12-18 22:05 ` [patch 67/78] kasan, mm: rename kasan_poison_kfree Andrew Morton
2020-12-18 22:05 ` [patch 68/78] kasan: don't round_up too much Andrew Morton
2020-12-18 22:05 ` [patch 69/78] kasan: simplify assign_tag and set_tag calls Andrew Morton
2020-12-18 22:05 ` [patch 70/78] kasan: clarify comment in __kasan_kfree_large Andrew Morton
2020-12-18 22:05 ` [patch 71/78] kasan: sanitize objects when metadata doesn't fit Andrew Morton
2020-12-18 22:05 ` [patch 72/78] kasan, mm: allow cache merging with no metadata Andrew Morton
2020-12-18 22:05 ` [patch 73/78] kasan: update documentation Andrew Morton
2020-12-18 22:05 ` [patch 74/78] mm/Kconfig: fix spelling mistake "whats" -> "what's" Andrew Morton
2020-12-18 22:05 ` [patch 75/78] epoll: convert internal api to timespec64 Andrew Morton
2020-12-18 22:05 ` [patch 76/78] epoll: add syscall epoll_pwait2 Andrew Morton
2020-12-18 22:05 ` [patch 77/78] epoll: wire up " Andrew Morton
2020-12-18 22:05 ` [patch 78/78] selftests/filesystems: expand epoll with epoll_pwait2 Andrew Morton
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